added phantomjs karma test to run in travis

tasks/default_task.js

@@ -1,4 +1,5 @@
 // Lint and build CSS
 module.exports = function(grunt) {
   grunt.registerTask('default', ['jshint:source', 'less:src']);
+  grunt.registerTask('test', ['default', 'karma:test']);
 };

tasks/options/karma.js

@@ -1,9 +1,14 @@
 module.exports = function(config) {
   return {
-    unit: {
+    dev: {
       configFile: 'src/test/karma.conf.js',
       singleRun: false,
       browsers: ['Chrome']
+    },
+    test: {
+      configFile: 'src/test/karma.conf.js',
+      singleRun: true,
+      browsers: ['PhantomJS']
     }
   };
 };